Basically, all you need is for the image to be online with a URL pointing to the .png file, which you can then paste here:
Here's a step-by-step guide:
- Upload the image to an image hosting site, such as Imgur.
- After uploading, right-click on the image and select "Copy Image link" or "Copy Image address" to obtain the URL that directly points to the .png file:
- Paste the URL that points to the .png file into the designated field and click "Insert":
Once the image is inserted, you can adjust its size. I recommend always adjusting images with excessive height, as they can disrupt the forum's reading experience due to the lack of height restrictions. The width is less of a concern since it has a fixed limit.